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Filamentous fungi - review and Oomycetes. Lecture 3. Four phyla of fungi. Chytridiomycota - no sexual spore Zygomycota - zygospore Ascomycota - ascospore Basidiomycota - basidiospore. Ascomycota. Botrytis cinerea - a fungus -causes grey mold. Powdery mildew of cucumber.

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four phyla of fungi
Four phyla of fungi
  • Chytridiomycota - no sexual spore
  • Zygomycota - zygospore
  • Ascomycota - ascospore
  • Basidiomycota - basidiospore
wilts caused by fusarium oxysporum
Wilts caused by Fusarium oxysporum

Darkened vascular tissue of cucumber caused by F. ox. f.sp. cucumerinum

Wilt of field grown melon caused by F. ox. formae speciales melonis

characteristics of basidiomycota
Characteristics of Basidiomycota
  • Mycelium is septate
  • Septa are perforated - sometimes with dolipore (doughnut shaped)
rhizoctonia solani
Rhizoctonia solani
  • It is a basidiomycete; teliomorph (Thanatephorus cucumeris) is rare.
  • Has very characteristic mycelium; typical of basidiomycete.
  • Differentiated into anastomosis groups (AG) (fusion of hyphae only occur if same anastomosis group)
oomycota
Oomycota
  • They are very different from true fungi:
  • Cell walls have cellulose and glucans.
  • Hyphae have no cross walls (septae).
  • Spore types:
  • Oospore = resting spore, sexual spore
  • Zoospores, zoosporangia = asexual spores
  • Examples:
  • Pythium -seed rot, damping off, root rot
  • Bremia, Peronospora, Plasmopara - downy mildews
slide44

Alnus glutinosa attacked by Alder Phytophthora

Brownish reddiscolouration

Oogonia

Oospore

Amphigyne two-celled antheridia

Alder stembase

Photo: Christer Olsson

symptoms of phytophthora alni ssp uniformis on alder alnus glutinosa
Symptoms of Phytophthora alni ssp. uniformis on alder (Alnus glutinosa)
  • The pathogen infects through wounds at the stembase or through the roots.
  • The tree tops die
  • The tree dies later
slide46

Phytophthora ramorum, chlamydospores. (Diameter 20 – 90 µm, 52.5 – 75 µm on this slide). Often germinating with a sporangiophore.

Isolat CH 180, (CBS 101328; P1357), The Netherlands, Rhododendron.

Heterothallic (A1).

Christer Olsson, 1/7 2002, DIA bilder